BS VII explained: What India’s upcoming emission rules mean for you

India’s next round of vehicle emission rules is taking shape. The Ministry of Road Transport and Highways has approved a proposed rollout schedule for Bharat Stage VII, starting in April 2029. Aligned with Europe’s Euro 7 standards, the norms would take effect in stages, with the final phase scheduled for April 2035. Light goods vehicles would follow in April 2030, with buses and heavier commercial vehicles joining in April 2031. Two-wheeler standards are expected separately. It should be noted that these are draft rules, with a consultation window for objections and suggestions. This means that manufacturers have an outline to work with and the final notification must settle the details.

What will change?

A car does not need an exhaust pipe to pollute. Every time its tyres wear down or its brakes shed particles, it adds to the material suspended in the air. That is the inconvenient detail behind India’s proposed Bharat Stage VII standards, which would extend vehicle regulation to electric cars while tightening scrutiny of combustion engines. From April 2031, the proposed framework would bring in limits on brake-particle emissions and requirements for tyre abrasion. The draft caps brake-particle mass emissions at 3 milligrams per kilometre for pure EVs and 7 mg per kilometre for the other specified powertrain categories, according to a report in The Hindu.

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The proposed rules span petrol, diesel, CNG, ethanol blends, hydrogen and hybrid powertrains, with EVs also subject to relevant energy-consumption and battery-performance requirements. The draft applies to M1 vehicles, the category covering passenger vehicles with up to eight seats in addition to the driver’s. Its first phase would set exhaust-emission limits alongside requirements for evaporative emissions, fuel and electricity consumption, and battery durability. Manufacturers would have to demonstrate that vehicles comply during laboratory tests, on public roads and after entering regular service, helping establish whether their pollution-control systems remain effective over time. On-board systems would monitor emissions and consumption, while a proposed Environmental Vehicle Passport would give users access to information about emissions, efficiency and battery health.

Vehicles would have to meet emission standards for eight years or 160,000 km, with further compliance requirements extending to 10 years or 200,000 km. The draft also provides for petrol-type and diesel vehicles equipped with geofencing technology to receive ‘BS-VII-G’ approval. Manufacturers would be required to declare and label compatibility with ethanol blends exceeding 20 per cent.

What about existing BS VI cars?

The proposal does not itself cancel a BS VI vehicle’s registration or require owners to retrofit it. Local restrictions and vehicle-retirement policies remain separate questions. Additional testing, monitoring and component development could increase manufacturing costs, although no credible universal price increase has been established. The eventual bill will depend on the vehicle and the engineering needed.

BS VII should also be distinguished from CAFE, the fleet-average fuel-efficiency framework. Both influence vehicle engineering, but they regulate different outcomes. BS standards address pollutants and related environmental requirements; CAFE targets manufacturers’ average fuel consumption and carbon dioxide performance. Meeting one set of obligations does not establish compliance with the other.

What battery durability means

For passenger EVs and plug-in hybrids, the draft proposes minimum retention of 75 per cent of initial battery energy during the first five years or 100,000km, whichever comes first. The subsequent minimum is 67 per cent, extending to eight years or 160,000km, again using whichever boundary arrives first.

These are proposed durability requirements. They should not be presented as an automatic entitlement to a free replacement battery. Nor should energy retention be treated as an exact prediction of driving range, which also depends on operating conditions.